Ok, i have got my mind set on a "super TF" and i have a budget for the following only.
Sigma's 120-400 or 150-500
70-200 f4 non is.
Now they will be for zoos, birding at reservoirs and safari parks and the odd sport do, the road race and TT at London 2012 esp. Also safari parks, so sometimes it will be distance work up to 150-200m reach.
There is a chance to get the lens now but i will now with costs be NOT able to buy a new 1.4TC if i buy new 70-200. So The 70-200, 1.4 TC route will have to be SH only.